O-Ring Buna N AS568 Dash Number 428 Actual Width 0.275 In. Actual Inside Dia 4.850 In. Outside Dia 5.400 In. Cross Section Shape Round Durometer Rating Medium Hard Durometer 90 Shore A Nominal Width 1/4 In. Nominal Inside Dia 4-7/8 In. Nominal Outside Dia 5-3/8 In. Color Black Temp Range -25 Degrees to 250 Degrees F Meets/Exceeds SAE J200 ASTM D2000 Package Quantity 10